(19)

(11)

EP 0 394 252 A1

(12)

(43) Date of publication: 31.10.1990 Bulletin 1990/44 (21) Application number: 88905849.0 (22) Date of filing: 22.06.1988

(51) International Patent Classification (IPC):  F23J( . ) C10L 10/ 04( . ) F23C 10/ 22( . ) C10L 9/ 10( . ) F23C 10/ 10( . ) F23J 7/ 00( . ) (86) International application number: PCT/FI1988/000098 (87) International publication number: WO 1988/010291 (29.12.1988 Gazette 1988/28)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI NL SE (30) Priority: 24.06.1987 US 19870065757 (71) Applicant: A. AHLSTROM CORPORATION FIN-29600 Noormarkku (FI)	(72) Inventors: ENGSTRÖM, Folke San Diego, CA 92122 (US) KIISKILÄ, Erkki, Johannes SF-48600 Karhula (FI) TÖRMIKOSKI, Pekka, Erik SF-49490 Neuvoton (FI) (74) Representative: Füchsle, Klaus, Dipl.-Ing., et al  Hoffmann, Eitle & Partner, Patentanwälte, Postfach 81 04 20 D-81904 München D-81904 München (DE)